switching techniques in data communication and networking

switching techniques in data communication and networking

• 1.
  Submitted by- CHANDNI VIJAYVARGIYA HARSHITAYADAV HIMANSHI CHARAN SALONI LADDHA SHIVANI JHANWAR SHWETA LALANI
• 2.
  • Switching isa process moving data from one interface and delivering it through another interface, selecting the best paths between machines that stores messages. • The fundamental purpose of a communication system is to exchange information between two or more devices. • A switched network consists of a service of interlinked nodes called switches, switches are hardware and software device capable of creating temporary connections b/w two or more devices linked to a switch but not to each other.
• 3.
  • CIRCUIT SWITCHING •PACKET SWITCHING • MESSAGE SWITCHING
• 4.
  • Circuit switchingis the dominant technology for both voice and data communication. • Communication via circuit switching in data communication networks implies that there is dedicated electrical, communication path between two ports or hosts. • The electrical path may be realized by physical wires or co axial cables or radio or satellite communication. • EX:- Telephone network connection.
• 6.
  • Packet-switched describesthe type of network in which relatively small units of data called packets are routed through a network based on the destination address contained within each packet. • Breaking communication down into packets allows the same data path to be shared among many users in the network. • This type of communication between sender and receiver is known as connectionless . • The control information should at least contain: – Destination Address – Source Address
• 7.
  •Datagram •Virtual circuit
• 8.
  • In Datagrampacket switching each packet is a self- contained unit with complete addressing information attached. • This fact allows packets to take a variety of possible paths through the network. • So the packets, each with the same destination address, do not follow the same route, and they may arrive out of sequence at the exit point node (or the destination). • Reordering is done at the destination point based on the sequence number of the packets.
• 9.
  •In the VirtualCircuit approach a pre-planned route is established before any packet are sent. •There is a call set up before the exchange of data. •All packets follow the same route and therefore arrive in sequence. •Each packet contains a virtual circuit identifier instead of destination address •More set up time •No routing decisions required for each packet - Less routing or processing time •Susceptible to data loss in the face of link or node failure •Clear request to drop circuit •Not a dedicated path
• 10.
  • A messageis a logical unit of information and can be of any length. • In message switching, if a station wishes to send a message to another station, it first adds the destination address to the message. • Message switching does not establish a dedicated path between the two communicating devices i.e. no direct link is established between sender and receiver. • Each message is treated as an independent unit.
• 12.
  SUBMITTED TO – KAVITAROY MA’AM